Question 9

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waecmaths question: 

Which of the following number lines illustrates the solution of the inequality $4\le \tfrac{1}{3}(2x-1)<5$?

Option A: 

Option B: 

Option C: 

Option D: 

waecmaths solution: 

$\begin{align}  & 4\le \tfrac{1}{3}(2x-1)<5 \\ & \text{Multiply both sides by}3 \\ & 12\le (2x-1)<15 \\ & \text{Add 1 to both sides} \\ & 13\le 2x<16 \\ & \text{Divide both sides by }2 \\ & 6.5\le x<8 \\\end{align}$Option D

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